I posted this question on Stack Overflow, but was advised to post it here.
I fitted the same data set to a 1PL item response theory model (called
onePL below), and then to a 2PL item response theory model (called
twoPL) below.. Subsequently, I ran an ANOVA analysis to investigate which model had the best fit (using
anova(onePL, twoPL). I used the TAM package. Is anybody here familiar with interperting the output of such an ANOVA analysis? In the attached picture it looks like model 1 had a better fit, but surely, that's incorrect?
I would be very grateful for any help or suggestions.